Abstract
A deterministic control of vortex chirality in ferroelectrics under a direct electric field is a challenging task. In this study, a novel method is proposed to deterministically switch a single polarization vortex in either a ferroelectric nanowire or a ferroelectric nanodot by using asymmetry electric field. Based on atomic simulations in the framework of the shell model, we demonstrate that the single polarization vortex is easily formed in ferroelectric nanowire or nanodot from a pair of 180°domains, which is generated by asymmetry electric field. More importantly, the use of asymmetry electric field can switch the direction of the 180° domains, and thereby, deterministically switch the chirality of polarization vortex. The present study provides instructive guideline for the future development of nanoscale ferroelectric devices in general and of FRAM in particular.
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